Compilare: user.cpp: In function ‘void op3()’: user.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<a[a1].size(); ++k)if(a[a1][k]==i)break; ^ user.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k+j<a[a1].size())d1=a[a1][k+j]; ^ user.cpp: In function ‘void uni(int, int)’: user.cpp:91:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<a[a2].size(); ++k){ ^ user.cpp:104:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<a[a1].size(); ++k){ ^ user.cpp:112:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<a[a1].size(); ++k){ ^ user.cpp: In function ‘void op1()’: user.cpp:122:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k; ^ user.cpp: In function ‘int main()’: user.cpp:136:12: warning: unused variable ‘test’ [-Wunused-variable] int i, test, m; ^ user.cpp: In function ‘void op4()’: user.cpp:22:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &i); ^ user.cpp: In function ‘void op3()’: user.cpp:34:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &i, &j); ^ user.cpp: In function ‘void op2()’: user.cpp:53:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &i, &j); ^ user.cpp: In function ‘void op1()’: user.cpp:123:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &i, &j); ^ user.cpp: In function ‘int main()’: user.cpp:137:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri4.in", "r", stdin); ^ user.cpp:138:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri4.out", "w", stdout); ^ user.cpp:139:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m);